# monthdays = {"Jan": 31, "Feb": 28, "Mar": 31, "Apr": 30, "May": 31, "Jun": 30, "Jul": 31, "Aug": 31, "Sep": 30, "Oct": 31, "Thi": 40}
# x = {"Nov": 30, "Dee": 31}
# monthdays.update(x)
# print(monthdays)
# monthdays = {**monthdays, **x}
# print(monthdays)
# monthdays = monthdays | x
# print(monthdays)

# monthdays = {"Jan": 31, "Feb": 28, "Mar": 31, "Apr": 30, "May": 31, "Jun": 30, "Jul": 31, "Aug": 31, "Sep": 30, "Oct": 31, "Thi": 40}
# x = {"Nov": 30, "Dee": 31}
# monthdays.update(x)
# monthdays.pop("Thi", None)
# print(monthdays)
# del monthdays["Thi"]
# print(monthdays)

# monthdays = {"Jan": 31, "Feb": 28, "Mar": 31, "Apr": 30, "May": 31, "Jun": 30, "Jul": 31, "Aug": 31, "Sep": 30, "Oct": 31, "Thi": 40}
# x = {"Nov": 30, "Dee": 31}
# monthdays.update(x)
# monthdays.pop("Thi", None)
# monthdays["Feb"] = 29
# print(monthdays)

# monthdays = {"Jan": 31, "Feb": 28, "Mar": 31, "Apr": 30, "May": 31, "Jun": 30, "Jul": 31, "Aug": 31, "Sep": 30, "Oct": 31, "Thi": 40}
# x = {"Nov": 30, "Dee": 31}
# monthdays.update(x)
# monthdays.pop("Thi", None)
# monthdays["Feb"] = 29
# print(monthdays["Oct"])

# monthdays = {"Jan": 31, "Feb": 28, "Mar": 31, "Apr": 30, "May": 31, "Jun": 30, "Jul": 31, "Aug": 31, "Sep": 30, "Oct": 31, "Thi": 40}
# x = {"Nov": 30, "Dee": 31}
# monthdays.update(x)
# monthdays.pop("Thi", None)
# monthdays["Feb"] = 29
# print(monthdays.get("Xyz", "NoFound"))

# monthdays = {"Jan": 31, "Feb": 28, "Mar": 31, "Apr": 30, "May": 31, "Jun": 30, "Jul": 31, "Aug": 31, "Sep": 30, "Oct": 31, "Thi": 40}
# x = {"Nov": 30, "Dee": 31}
# monthdays.update(x)
# monthdays.pop("Thi", None)
# monthdays["Feb"] = 29
# print(monthdays.keys())

# monthdays = {"Jan": 31, "Feb": 28, "Mar": 31, "Apr": 30, "May": 31, "Jun": 30, "Jul": 31, "Aug": 31, "Sep": 30, "Oct": 31, "Thi": 40}
# x = {"Nov": 30, "Dee": 31}
# monthdays.update(x)
# monthdays.pop("Thi", None)
# monthdays["Feb"] = 29
# print(monthdays.values())

# monthdays = {"Jan": 31, "Feb": 28, "Mar": 31, "Apr": 30, "May": 31, "Jun": 30, "Jul": 31, "Aug": 31, "Sep": 30, "Oct": 31, "Thi": 40}
# x = {"Nov": 30, "Dee": 31}
# monthdays.update(x)
# monthdays.pop("Thi", None)
# monthdays["Feb"] = 29
# print(monthdays.items())

# score = {"王星": 87, "刘艺": 77, "马跃": 60, "李小辉": 94, "刘天天": 95, "秦天": 85}
# print(sum(score.values()) / len(score))
# print(max(score, key=score.get))





